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Dictionary Learning Phase Retrieval from Noisy Diffraction Patterns

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Details

Original languageEnglish
Article number4006
Number of pages27
JournalSensors
Volume18
Issue number11
DOIs
Publication statusPublished - 16 Nov 2018
Publication typeA1 Journal article-refereed

Abstract

This paper proposes a novel algorithm for image phase retrieval, i.e., for recovering complex-valued images from the amplitudes of noisy linear combinations (often the Fourier transform) of the sought complex images. The algorithm is developed using the alternating projection framework and is aimed to obtain high performance for heavily noisy (Poissonian or Gaussian) observations. The estimation of the target images is reformulated as a sparse regression, often termed sparse coding, in the complex domain. This is accomplished by learning a complex domain dictionary from the data it represents via matrix factorization with sparsity constraints on the code (i.e., the regression coefficients). Our algorithm, termed dictionary learning phase retrieval (DLPR), jointly learns the referred to dictionary and reconstructs the unknown target image. The effectiveness of DLPR is illustrated through experiments conducted on complex images, simulated and real, where it shows noticeable advantages over the state-of-the-art competitors.

Keywords

  • complex domain imaging, phase retrieval, photon-limited imaging, complex domain sparsity, dictionary learning, SPARSE, IMAGE, RECONSTRUCTION, RECOVERY, CRYSTALLOGRAPHY, ALGORITHMS

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